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Dating constraints provided by depth profiles of 137Cs and the ratio U/R. Depositional ages estimated by a 210Pb-derived constant mass accumulation model and a constant length accumulation model derived from 137Cs are shown. Dashed lines follow the bottom scale; solid lines follow the top scale. All data are plotted at the top of the corresponding depth interval. Error bars indicate ±1σ counting errors on radionuclide analyses.
